General Information: Structure

Fig 1: ETACS-ECU - CAN Communication Diagram

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

A gateway function has been integrated to ETACS-ECU as the network central ECU.
The CAN system consists of the following three networks: CAN-B (middle-speed body network), CAN-C (high-speed power train network), and the diagnosis CAN-C (diagnosis exclusive network). Each ECU is connected to one of the networks depending on its functions.
The CAN bus line consists of two lines, CAN_L and CAN_H (CAN Low and CAN High, respectively), as well as two terminal resistors (A twisted-pair cable, highly resistant to noise, is used for the communications line).
The CAN bus line connecting two dominant ECUs is the main bus line, and the CAN bus line connecting each ECU is the sub-bus line.
With CAN-C, the terminal resistors are incorporated in ECU. Resistors with approximately 120 ohms is used for the dominant ECU, and that with 3.0 kΩ is used for the non-dominant ECU.
- Dominant ECU: ETACS-ECU and engine ECU
- Non-dominant ECU: ECU and sensor on CAN-C network, excluding ETACS-ECU and engine ECU
To the CAN bus line, ECU, sensor, and data link connector are connected as follows for each network.

CAN-B

Wireless control module (WCM) <vehicles without KOS>
KOS-ECU <vehicles with KOS>
SRS-ECU
Occupant classification-ECU
A/C-ECU <vehicles with A/C>
Heater control unit <vehicles without A/C>
Radio and CD player or CD changer <vehicles without Mitsubishi Multi-Communication System (MMCS)>
CAN box unit <vehicles with Mitsubishi Multi-Communication System (MMCS)>
Hands-free module <vehicles with hands-free system>
Satellite radio tuner <vehicles with satellite radio>
Combination meter

CAN-C

DIAGNOSIS CAN-C